Pin Pandas and NumPy versions

[kafitzgerald]

In order to get a working environment with uv and CI passing again, we need to pin these two dependencies.

Newer version of NumPy aren't supported by Numba, but install anyway and then break stuff if we don't have the version pin.

And then Pandas 3 and newer will break Bridescaler at the moment (test suite fails) so we should pin that until it's addressed.

[kafitzgerald]

I don't think I can request reviewers, but tagging @djgagne here.

@kevinyang-cky and I sorted this out this morning.

And here's a CI run on my fork that shows this passing in case that's helpful: https://github.com/kafitzgerald/bridgescaler/actions/runs/21724800653

[kevinyang-cky]

Thank you @kafitzgerald for helping out with the testing. We have decided to adapt the edits here into #23 and close this one here.